Can we allow more file upload types?

It looks like this is possible at http://forum.goatech.org/admin/site_settings/category/files and right now just images are allowed.

The use case is that @dornawcox and @donblair were wanting to attach a Scratch file and couldn’t.

For example, wordpress.com allows these http://forum.goatech.org/admin/site_settings/category/files (not that these would have helped with a Scratch file) but maybe they do some kind of virus scanning on upload?